Securing means for laboratory or workshop apparatus



y 28, 1931- L. D. J. A. DUNOYER 1,815,723

SECURING MEANS FOR LABORATORY OR WORKSHOP APPARATUS 2 Sheets-Sheet 2 Filed Nov. 14. 1929 Patented July 28, 1931 UNITED STATES. PATENT OFFICE LOUIS nommmun JOSEPH Armani) nuuovnn, or N'nUILLY-sUn-sEINE; airmen SECURING MEANS FOR LABORATORY 0R 'WORKSHOP'APPARATUS Application filed November 14, 1929, Serial No. 407,303yand in France November 26,1928.

It is often necessary inlaboratories or workshops to fix an object in space in a pre determined position. For this purpose, the object-is gripped by a pair of tongs comprising a cylindrical extension or tailpiece which is inserted in one of the jaws of a connecting clamp while the other jaw incloses a cylindrical rod which is usually vertical and mounted on a base, thereby constituting a mgsupport. The object may be brought into any desired position and fixed therein by sliding and rotating the clamp along the vertical rod of the support whereupon the extension or tailpiece of the tongs is also *;ada ted to slide and rotate in the clamp.

T e: supporting tongs now'existing have usually the drawback that the positionin space of the object to be fixed is altered by the securing action proper so that it isneczoressa-ry to make lengthy adjustments for fixing the object in the desired position and when the object is removed, it is practically impossible to replace it in exactly the same the same tongs .cannot position. Moreover, 25;;be fastened equall as well over rods of very small diameter, for instance a few millimeters and those of largev diameter, for instance, several centimeters. Finaly, these tongs are usually notable tozbe fastened aoziover very short members such as for instance a flat washer, the thickness ofiwhich is only a few millimeters.

The present invention relates to fastening tongs whichdo not have the aforesaid draw- 35.:backs.

that the position in space of a cylindrical or prismatic member tobe fastened is exactly the same after as before the fastening This member may therefore beremoved and lOiinserted again with the assurance that its A special feature of these tongs .is

, threaded rod 3 is adapted to slide with axiswill occupy the same position in space."

Thisfastening and fixing deviceis char.- acterized by the fact thatit comprises a V- shaped mem er iadapted to receive the obliiijject to be strap secured through one end to. the

shaped memberi and through the other endtov suitable itensioning means.

If the object to flllldlllCiLl'LOl prismatic with faces relativeto held .or gripped .and aflexible be held orsgrippediis cyA thesameangle as the v shaped member, the two faces of the V-shaped member will form a bearingwith regard to which the position in space of the axis of the object'is'geo-v metrically determined and consequently is always the same. v

Various details, which will hereinafter be" explained, permitvthe adaptation of the in vention to the several cases. to be meta with in practice and the utilization of all the'a'dvantages thereof. 7 a

I have described hereinbelow'by way' of example and shown on appended drawings several forms ofexecution of my iriventinni Fig. 1 is an end view of: V-shaped tongs.

Fig. 1a is a side view thereof;

Figs. 2 and 2a. arecorrespondingviews of" tongs adapted for use with parts havinga 1 small diameter.

Fig. 8 is an end View the latter: device. I a

Fig; 4 is a side view of a notched prism" cut to serve as an "intermediary support be tween the V-shap ed part and the object to be held. v e

Figs. 5 and 5a correspond to Figs. 3 and 4 wherein the" notched" prism "is replaced by a notched cylinder. 7 1

Fig; 6 is an end View" and Fig. 6a a side i view of :a double V-shaped part "serving as a sliding carriage. l

Referring to Figs. 1 and lathe body pr the tongs comprises a tube 1 to the end of which is soldered orf brazed throughlits ridge a V-shaped'part 2; Inv thetubel the slight friction, the rotation of which rod 'is prevented by a suitable device suchasa projec tion4 raised onthe tubel and engaging a longitudinal groove 5 formed inside the threaded rod 3. 011 this rod is screwed an independent mac. To the inner end of the rod 3 is secured ayielding and resistant ribbon or the like'elongated part 7 passingpu't of the tube 1 through the elongated'aper ture 8 and ending with an eye 9 adapted"-to' be fittedovera knob 10 carriedby"part after passing round-theobject to-be heldt The ribbon 7 may obviously be repl aced -by a flexible cable, a chainflora -springa "of a =mo'dificat ion of' 'ened and above which When itis desired to secure a cylindrical or prismatical object in the tongs, the eye 9 is released from the knob 10, the object is inserted between the sides of the V-shaped part and the ribbon 7 is wound over the object, The eye 9 is then fitted over the knob 10 and the threaded rod 3 pulled clown- Wards after which the nut 6 is-screwed down until it abuts against the end of the tube 1 and the object is fastened with the desired strength;

When it is desired to secure smaller cylinders I may use oneof the following de vices. One of these is shown on Figs. 2 and 2a. In the sides of the V are provided slots 11 affording a passage for the fastening means 7. The other device is shown on Figs. 3, 4, 5 and 5a. A prism having a square section 12 is disposed inside the V and along one or more edges thereof are provided V- shaped grooves 13 of varying depths. This prism may be of any suitable material. Its sides may be in immediate contact with the sides of the V. But this would require an accurate machining. Inv order to avoid this, I prefer to interpo'se between the V and the prism thin and narrow strips of a suitable plastic material such as an asbestos sheet.

Instead of these strips of plastic material, I

may provide one side of the prism with three projections 15 and the adjacent side with two projections 16 as shown on Fig. 4 so as to ensure a geometrically accurate positioning of the prism inside the V, whatever may be (inside certain limits) the angle between the sides of the V, the angle between the sides of the prism and the state of the surfaces of the V. I may also instead of a prism use a cylinder 17 as shown on Figs. 5 and 5a on the surface of which are provided a certain number of V-shaped longitudinal grooves of varying depths.

Obviously the prism 12 or the cylinder 17 may be either merely held between the object to be held and the V-shaped part or else secured to the latterthrough any suit-.

able removable means.

V The above described forms of execution of the invention are particularly adapted for rigidly securing a cylindrical object inside the V-shaped tongs. But in other cases it may be of interest to allow the object to slide between the sides of the V with slight friction. A device adapted for such a use is shown in Figs. '6 and 6a. The tongs comprise as formerly, a tube 1 soldered or brazed to the V-shaped part 2, a sliding threaded rod 3, a projection 4, a longitudinal groove 5, a nut 6, a ribbon 7, an aperture 8, an eye 9 and a knob 10. One of the edges of the V is secured in the present case through slightly yielding connections 19 to the corresponding side of another V-shaped part 20 re versely disposed over the object to be fast the fastening ribbon 7 is caused to pass. If the nut 6 is completely screwed down, the cylindrical rod 21 is held tight; but when slightly slackened, said rod may slide with slight friction with as small a play as may be desired, along the sides of the two V-shaped parts. To the lower V 20 may be soldered or brazed a rod such as 22 which may in its turn carry any suitable device. By way of example, I may provide a support constituted by a vertical rod 21 the cross-section of which may, for instance, be circular or square, carried by a support and along which the arrangement of the two V-shaped parts and of the device borne by the rod 22 is adapted to slide.

If this device is a tracing point, the whole will constitute a mechanicians gauge; if this device is a sighting telescope, a cathetometer will thus be formed for. measuring differences in level; in this case if the vertical rod has a square cross-section it ispreferably adapted to move round its axis and may be secured in any one of the different positions itcan be given.

In order to allow the double V tongs, to slide perfectly along the cylindrical rod 21 without the sides of the V requiring any machining, the sides of the V may be provided with two projections 23 so that each V mayremain in contact without any play and without the necessity of any adjustment through four points with the cylindrical I part of the rod.

1. A precision securing device for ensuring a precise position, and always the same position, relative to the part which is secured, comprising a V-shaped member forming a geometrical dihedron, adapted to receive the part that is secured, and a flexible fastening strap adapted to pass over the part to be gripped, one end of the said strap being fixed in an easily removable manner to one of the sides of the V-shaped member, and the other end being connected to a suitable tensioning means.

2. A precision securing device for ensuring a position, and always the same position,

relative tothe object which is secured, com prising a V-shaped member forming a geometrical dihedron adapted to receive the object which is to be secured, a hollow tube fixed to the V-shaped member on the side opposite the bearing surfaces, a threaded non-rotatable rod slidingly operating in the hollow tube and having a clamping nut thereon in engagement with the end of the hollow tube, and a flexible fastening strap adapted to pass over the object being gripped thereby, one end of said strap being fixed in an easy removable manner to one of the sides of the V-shaped member and the other end fixed to the end of the aforesaid threaded rod. 7

3. A precision securing device. for ensuring a position, and always the same position, relative to the part which is secured, comprising a V-shaped member forming a geometrical dihedron adapted to receive the part to be gripped, a removable block pro-. vided with longitudinal notches in the form of a geometrical V gearing with its parts not provided with notches, against the V- shaped support, and a flexible fastening strap adapted to pass over the part to be gripped, one end of the said strap being fixed in an easily removable manner to one of the sides of the V-shaped member, and a tensioning means connected to the other end of said strap.

4. A precision securing device for ensuring a position, and always the same position, relative to the part which is secured, comprising a V-shaped member forming a geometrical dihedron, a removable prismatic block provided with notches in the form of a geometrical V, bearing with its parts not provided with notches, against the V-shaped support,- and a flexible fastening strap 5 adapted to pass over the part to be gripped, one end of the said strap being fixed in an easily removable manner to one of the sides of the V-shaped member, and a tensioning means fastened to the other end of said so flexible strap.

5. A precision securing device for ensuring a position, and always the same position, relative to the part which is secured, comprising a V-shaped member forming a geometrical dihedron, a removable prismatic block provided with notches in the form of a geometrical V, bearing with its parts not provided with notches, against the V-shaped support by suitable bosses or lugs, and a 40 flexible fastening strap adapted to pass over the part to be gripped, one end of the said strap being fixed in an easily removable manner to one of the sides of the V-shaped member, and a tensionin means connected as to the other end of said ilexible strap.

6. A precision securing device for ensuring a precise position, and always the same position, relative to the part which is secured therein, comprising a V-shaped memso ber forming a geometrical dihedron adapted to receive the part to be gripped, a second geometrical V-shaped member arranged in an opposite direction to the first one, and placed in opposed relation therewith, and

52 a securing member for ensuring the support of the said parts being held, on the faces of the V-shaped member.

In testimony whereof I have afiixed my signature.

0-3 LOUIS DOMINIQUE JOSEPH ARMAND DUNOYER. 

